Association of Residential Managing Agents

Members' Area

Leaseholder Library

Welcome to the Leaseholder Library

ARMA self-service library offers guidance to leaseholders. We would recommend that you view the documents available to see if they can assist.

If they do not, or you require further information then please contact the Leasehold Advisory Service at They are a government funded body who are able to assist you and they provide free information, initial advice and guidance to members of the public about residential leasehold. They are independent and impartial and all of their advisers are legally qualified.


Posted: 18 / 03 / 2019

Updated: 19 / 07 / 2023

Japanese Knotweed


Japanese knotweed, also known as Fallopia japonica or Polygonum cuspidatum, is a non-native plant introduced by Victorian plant hunters in the mid 19th century. Its popularity grew because of its ability to grow quickly, forming dense screens. However, this characteristic meant it could out-compete indigenous species and it quickly became a problem. Plants were still being sold though until the early 20th century and it can now be found across the country.

Download the full Advice Note above.